Tektronix 4000 Series Manual de usuario



Install a DPO4USB application module in an

MSO/DPO4000 Series oscilloscope



Connect two P6139A passive probes (for

Low-Speed and Full-Speed USB) to

oscilloscope channels 1 and 2,

or connect a TDP1000 differential probe (for

High-speed USB) to channel 1



Press Default Setup button



Set Record Length to 1M points

12a 2bHigh-speed USB

Bus Setup

(requires 1 GHz model)

Wave Inspector – Pan/Zoom

3 4 USB Bus Event Table

Demo

Demo Notes

Show how to look at each packet with Wave

Inspector Pan/Zoom control.



Connect channel 1 to D+ and channel 2 to D-,

and turn on channel 2



Set Vertical Scales to 2 V/div and position

waveforms in upper half of display



Set Horizontal Scale to 100 s/div



Set Trigger Level to about 1.4 V



Press B1 button and set Bus Type to USB



Press Define Inputs and select appropriate

USB speed and single-ended inputs



Set Threshold values to 1.4V



Set Trigger Type to Bus



Set Trigger On to Sync



Press Menu Off button



Press Single button



Connect + input to D+ and – input to

D-



Set Vertical Scale to 250 mV/div and

position in upper half of display



Set Horizontal Scale to 10 s/div



Set Trigger Level to about -100 mV



Press B1 button and set Bus Type to

USB



Press Define Inputs and select

appropriate High-speed USB



Set High Threshold to +100 mV and

set Low Threshold to -100 mV



Press Menu Off button



Press Single button



Adjust inner control to zoom in on a single

decoded packet of data



Adjust outer control to position the zoomed

area to display the decoded information



Press B1 button

Set Display As > Event Table to On



Multipurpose control scrolls

through Event Table messages

Demonstrate how easy it is to view an entire

acquisition as an event table.

Demo Training Fact Sheet

Tektronix 4000 Series Oscilloscopes

USB Bus Demo

www.testequity.com/tektronix

Low-speed and Full-speed

USB Bus Setup

Demonstrate how the oscilloscope can trigger

on LS and FS USB packet level content and

decode the entire acquisition. Show how a

MSO4104 or DPO4104 can decode an entire

HS USB acquisition after triggering on an edge.

4000 Series USB Bus Decoding

4000 Series USB Bus Search

For more information, see the “Debugging Serial Buses in

Embedded System Designs” Application Note.

4000 Series USB Bus Event Table

Determining USB Bus Bit Rate



Measure width of narrowest pulse(s) in USB message



Match the pulse width to the bit rate in the table below

Min Pulse

Width USB Bit

Rate USB

Speed

667 ns 1.5 Mb/s Low-speed

83 ns 12 Mb/s Full-speed

2.08 ns 480 Mb/s High-speed

www.testequity.com/tektronix 11/09 SD/WWW 3GW-24709-0

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